Great Value ... Useful Features ... It's a Megger!

Great Value ... Useful Features ... It's a Megger!

The Cuthbertson Laird Group regularly run promotions on the Megger MFT1711, 1721 and 1731 installation testers. In fact as a group they are our best-selling MFT. One of the things our customers often ask is "which one would be best for me?" Well to help you decide we've put together this short comparison page and added it to our website as a blog. Have a look and hopefully it will help you decide.


The MFT1700 series Multi-function tester is a compact instrument designed to perform all of the functions required by the electrical contractor to fully test domestic, commercial and industrial wiring. Specially designed to comply with U.K., European and other International wiring regulations and standards, the MFT1700 may be used on all single and three phase systems with rated voltages up to 300 V AC. rms to earth (ground).

The whole range of testers now has full auto RCD testing as well as True RMS voltage measurement. Other range wide additions are the 1 kV insulation resistance test voltage and the inclusion of 10 mA as well as variable RCD rated tests.

Another really useful feature that can now be found on every instrument is the ZMAX function ensuring testing final ring circuits is quick and easy.

When testing continuity, nulling the test leads is simple and the meter retains the null value even when changing the batteries. And when loop impedance testing, there is no need to null your leads at all.

Because it is rated at Category IV for safety, as well as being dust and rain proof to IP54, it means that you can use your Megger MFT1700 in almost any environment without a second thought.

The Megger MFT1700 series is a range of 3 instruments for testing low voltage electrical installations to BS7671. They provide all the tests required to complete the necessary electrical certification for industrial, commercial and domestic fixed wiring installations, including:

System voltage and frequency measurement TRMS.
Insulation test at 100 V*, 250 V, 500 V and 1000 V.
Including input protection against live circuits up to 600 V even when insulation test is locked-on.
Continuity resistance at 200 mA or 15 mA.
Automatic start - no need to press TEST so leaving both hands free to hold probes.
Resistance range up to 100 kΩ with fast continuity buzzer at selectable thresholds.

Earth loop test
2 and 3 wire non-trip range.
2 wire Hi current including phase to phase.
Prospective fault current measurement up to 20 kA.

RCD testing including:
Type AC, A, S, B* and programmable RCDs.
3-phase RCDs*.
Auto-test routine.
Fault (Touch) voltage display.

Earth spike testing
Stakeless techniques.
* model dependant.

All instruments are IEC 61010 CAT IV 300 V rated for connection to low voltage systems with no protective device, so safe for connection anywhere on the system right up to the source transformer without risk of damage from large transient spikes.

Megger MFT1700 Animation:

Megger MFT1700 Series Comparison Chart:
FEATURES MFT1711 MFT1721 MFT1731 MFT1741
Insulation ranges
100 V   Y Y Y
250 V, 500 V Y Y Y Y
Test voltage display Y Y Y Y
Adjustable buzzer threshold   Y Y Y
Continuity and resistance ranges
200 mA test Y Y Y Y
15 mA test   Y Y Y
Adjustable buzzer threshold Y Y Y Y
Loop testing
2 and 3 wire non-tripping L-PE 50 V ~ 280 V Y Y Y Y
2 wire Hi current L-N 50 V ~ 280 V y Y Y Y
2 wire phase to phase L-L 50 V ~ 500 V   Y Y Y
PSCC and PFC (20 kA max.) Y Y Y Y
Max. Zs display Y Y Y Y
R1 + R2 value   Y    
Touch voltage display on faulty earth Y Y Y Y
Earth electrode test
2 and 3 pole     Y Y
3 pole ART and Stakeless method **     Y Y
** requires optional accessory
RCD tests
1/2, 1, 5 x I and ramp RCD test Y Y Y Y
Auto RCD test Y Y Y Y
Type AC, A and S RCDs Y Y Y Y
Type B (pure DC) RCDs   Y Y Y
Programmable RCD Y Y Y Y
3-phase RCD (no earth)   Y Y Y
30, 100, 300 and 500 mA RCD Y Y Y Y
10 mA and 1000 mA RCD 10 mA Y Y Y
Other features
Supply measurement Y Y Y Y
True RMS Y Y Y Y
Leakage current measurement **   Y Y Y
Phase rotation   Y Y Y
Calibration certificate Y Y Y
Rechargeable batteries (charger included)     Y Y
SP5 Switched probe included   Y Y Y
Warranty upgradeable to 3 years FREE Y Y Y Y
On board memory with Bluetooth® download     Y Y
CAT IV 300 V / CATIII 600 V Y Y Y Y
Hard moulded case Y Y    
Soft pouch with additional storage     Y Y

Leave a reply